Leaching of coarse solid lumps is also termed as _____________________?

Related Mcqs:

1. The ‘shanks system’ of leaching (i.e., counter-current multiple contact leaching) is used for____________________?

   A. Recovery of tannis from the tree barks and woods
   B. Leaching sodium nitrate from Chilean nitrate bearing rock
   C. Both A. and B.
   D. Neither A. nor B.

2. It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ?

   A. 15 min
   B. 51 min
   C. 71 min
   D. 94 min

3. With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system) ?

   A. Increases
   B. Decreases
   C. Remain unaffected
   D. Increases Linearly

4. With increase in temperature, the leaching rate increases because of the _____________________?

   A. Increased diffusivity
   B. Decreased viscosity of liquid
   C. Both A. and B.
   D. Neither A. nor B.

5. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?

   A. M(Xo – XF)
   B. M(Xo/XF)
   C. M ln(Xo/XF)
   D. MXo ln(Xo/XF)

6. The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?

   A. √T
   B. T
   C. T2
   D. T3

7. Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant______________________?

   A. Humidity
   B. Velocity
   C. Temperature
   D. All A., B. & C.

8. The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?

   A. √T
   B. T
   C. T2
   D. T3

9. Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant____________________?

   A. Humidity
   B. Velocity
   C. Temperature
   D. All A., B. & C.

10. The drying time between fixed moisture contents within the ‘constant rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?

    A. √T
    B. T
    C. T1.5
    D. T3